...the premise has me puzzled.
1. As soon as the player returned to enemy lines (
from the German perspective), what exactly would prevent him from just turning himself in at the first opportunity, and explaining his situation?
2. Given
the choice, most allied soldiers would've most likely chosen death, over betrayal of their own comrades...even more so if the demands were being made by WW2 Nazi Germany.
3. How exactly would the Germans kill the player, if he fails to assassinate the targets he's been ordered to eliminate? It would really defeat the purpose, if German soldiers (
even in disguise) were following the player around, to monitor his actions.
To be plausible, I believe that serious thought and re-evaluation must be made, if this storyline is to have any believabilty...